JVM crashed in Compile::start() w/ UseRTMDeopt and UseRTMForStackLocks turned on.
I was able to reproduce issue on linux host only with both product and fastdebug builds:

Stack: [0x00007f1c9e55c000,0x00007f1c9e65d000], sp=0x00007f1c9e659d90, free space=1015k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x48603b] Compile::start() const+0xb
V [libjvm.so+0x858a5a] LoadNode::Ideal(PhaseGVN*, bool)+0x25a
V [libjvm.so+0x927d89] PhaseGVN::transform_no_reclaim(Node*)+0x29
V [libjvm.so+0x5dd112] GraphKit::make_load(Node*, Node*, Type const*, BasicType, int, MemNode::MemOrd, bool)+0xc2
V [libjvm.so+0x90b333] Parse::rtm_deopt()+0xf3
V [libjvm.so+0x90d5fd] Parse::Parse(JVMState*, ciMethod*, float, Parse*)+0x73d
V [libjvm.so+0x3e7009] ParseGenerator::generate(JVMState*, Parse*)+0x99
V [libjvm.so+0x49248c] Compile::Compile(ciEnv*, C2Compiler*, ciMethod*, int, bool, bool, bool)+0x125c
V [libjvm.so+0x3e5ae8] C2Compiler::compile_method(ciEnv*, ciMethod*, int)+0x198
V [libjvm.so+0x49acda] CompileBroker::invoke_compiler_on_method(CompileTask*)+0xc8a
V [libjvm.so+0x49d6b0] CompileBroker::compiler_thread_loop()+0x620
V [libjvm.so+0xa277af] JavaThread::thread_main_inner()+0xdf
V [libjvm.so+0xa278dc] JavaThread::run()+0x11c
V [libjvm.so+0x8e4828] java_start(Thread*)+0x108
C [libpthread.so.0+0x79d1]

Current CompileTask:
C2:1277573 29160 % 4 article2html::topLevel @ 34 (183 bytes)

With fastdebug builds following assert fails:
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/opt/jprt/T/P1/072614.amurillo/s/src/share/vm/opto/compile.cpp:1157), pid=4150, tid=140362568251136
# assert(!failing()) failed:
#
# JRE version: Java(TM) SE Runtime Environment (8.0_20-b22) (build 1.8.0_20-ea-fastdebug-b22)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.40-b02-internal-201407110726.amurillo.hs25-40-b02-set-ve-fastdebug mixed mode linux-amd64 compressed oops)
# Core dump written. Default location: /export/local/aurora/sandbox/results/kitchensink/core or core.4150
#
# If you would like to submit a bug report, please visit:
# http://bugreport.sun.com/bugreport/crash.jsp
#

Current thread (0x00007fa8cc343cf8): JavaThread "C2 CompilerThread0" daemon [_thread_in_native, id=4216, stack(0x00007fa8b4f53000,0x00007fa8b5054000)]

Stack: [0x00007fa8b4f53000,0x00007fa8b5054000], sp=0x00007fa8b50504c0, free space=1013k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0xfb1d6a] VMError::report_and_die()+0x2da
V [libjvm.so+0x71ad64] report_vm_error(char const*, int, char const*, char const*)+0x84
V [libjvm.so+0x682cd6] Compile::start() const+0x46
V [libjvm.so+0xc7fa49] LoadNode::Ideal(PhaseGVN*, bool)+0x129
V [libjvm.so+0xdb611f] PhaseGVN::transform_no_reclaim(Node*)+0x3f
V [libjvm.so+0x88ee30] GraphKit::make_load(Node*, Node*, Type const*, BasicType, int, MemNode::MemOrd, bool)+0x120
V [libjvm.so+0xd8256a] Parse::rtm_deopt()+0x15a
V [libjvm.so+0xd8960a] Parse::Parse(JVMState*, ciMethod*, float, Parse*)+0xa5a
V [libjvm.so+0x572689] ParseGenerator::generate(JVMState*, Parse*)+0xb9
V [libjvm.so+0x693aa3] Compile::Compile(ciEnv*, C2Compiler*, ciMethod*, int, bool, bool, bool)+0x1483
V [libjvm.so+0x570111] C2Compiler::compile_method(ciEnv*, ciMethod*, int)+0x2c1
V [libjvm.so+0x6a181e] CompileBroker::invoke_compiler_on_method(CompileTask*)+0xace
V [libjvm.so+0x6a2754] CompileBroker::compiler_thread_loop()+0x5f4
V [libjvm.so+0xf39491] JavaThread::thread_main_inner()+0x221
V [libjvm.so+0xf3979d] JavaThread::run()+0x2bd
V [libjvm.so+0xd48268] java_start(Thread*)+0x108
C [libpthread.so.0+0x79d1]

Current CompileTask:
C2:1471321 23086 % 4 article2html::topLevel @ 34 (183 bytes)

Issue could be reproduced starting from 8u20-b08 when RTM support was integrated.